I'm working with an online company that sends payments through a bank.
I sent them a payment request a while ago with my IBAN + the bank SWIFT and other details provided, so they could transfer the money to my personal account. unfortunately I did not receive the money.
Upon contacting them, they inform me that they sent the payment. how can I prove to them that I did not receive anything? or how can I prove that they really send the payment? ... is there for example a transaction ID that I can use for these situations?